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Old Jun 14, 2008 | 08:12 AM
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Question Help with Hissing sound
I have a hissing sound that i cant figure what is doing it.It's some where behide the TP or before the intake maybe one of those rubber pipes. The sound is always there. It just started last nite.Help me
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Old Jun 14, 2008 | 08:44 AM
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sounds like a vacuum leak
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Old Jun 14, 2008 | 08:59 AM
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I'm thinking the same thing but i cant find it
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Old Jun 14, 2008 | 09:01 AM
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I would tighten the intake some in the proper order which can be found on ls1howto.com, just to be sure....then look for and lines that are disconnected
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Old Jun 14, 2008 | 09:01 AM
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Originally Posted by 5301113
I have a hissing sound that i cant figure what is doing it.It's some where behide the TP or before the intake maybe one of those rubber pipes. The sound is always there. It just started last nite.Help me
is it like a whining sound cause my just started doing that too!
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Old Jun 14, 2008 | 09:16 AM
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Originally Posted by hevymetalg
is it like a whining sound cause my just started doing that too!
no its hissing. It sounds like when air is coming out of a tire
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Old Jun 14, 2008 | 09:17 AM
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Originally Posted by AFASTYZFR1
I would tighten the intake some in the proper order which can be found on ls1howto.com, just to be sure....then look for and lines that are disconnected
Nothing looks disconnected
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Old Jun 14, 2008 | 09:46 AM
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Originally Posted by 5301113
no its hissing. It sounds like when air is coming out of a tire
get some carb cleaner and spray it around the manifold see if the engine dies out and that will be where you leak is
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Old Jun 14, 2008 | 09:50 AM
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Originally Posted by hevymetalg
get some carb cleaner and spray it around the manifold see if the engine dies out and that will be where you leak is

OK after reading some posts.I hoping it's a ring seal or pcv rubber hose,egr ring seal.I'm hope it's not an intake leak
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Old Jun 14, 2008 | 10:59 AM
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Are you throwing any Check engine lights? Check on the underside of the PCV hose where it connects to the intake. Mine opened up a crack right there from the heat and the angle of that rubber hose. Mine was also throwing lean condition codes for bank 1 and bank 2.
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Old Jun 14, 2008 | 01:06 PM
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Originally Posted by tording99Z28
Are you throwing any Check engine lights? Check on the underside of the PCV hose where it connects to the intake. Mine opened up a crack right there from the heat and the angle of that rubber hose. Mine was also throwing lean condition codes for bank 1 and bank 2.

No codes yet but i do need to check the PCV hose
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Old Jun 14, 2008 | 03:50 PM
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FOUND A CRACK ON THE PCV HOSE .I dont know what size it is to replace it
It the hose from the tp to the pcv , two inches long
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Old Jun 14, 2008 | 04:57 PM
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i think it is 3/8"
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Old Jun 15, 2008 | 10:03 AM
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thanks i will order it from gm
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Old Jun 15, 2008 | 04:49 PM
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I just went and got myself a piece of 3/8" vacuum hose and used some clamps and made my own 2" piece that goes there. I tried to order just that little piece but its part of the hole PCV tube assembly which is like $110 from the dealer. If you find just that little piece for sale somewhere let me know please.
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Old Jun 16, 2008 | 11:01 AM
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Originally Posted by tording99Z28
I just went and got myself a piece of 3/8" vacuum hose and used some clamps and made my own 2" piece that goes there. I tried to order just that little piece but its part of the hole PCV tube assembly which is like $110 from the dealer. If you find just that little piece for sale somewhere let me know please.
Ok let me check in to it
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Old Jun 16, 2008 | 01:30 PM
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i would also recommend changing the egr pipe seal! i dont think mine was leaking but when i took it out it looked all melted and screwed up! and its only like 5 bucks from GM
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Old Jun 16, 2008 | 03:25 PM
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Originally Posted by ae13291
i would also recommend changing the egr pipe seal! i dont think mine was leaking but when i took it out it looked all melted and screwed up! and its only like 5 bucks from GM
Is that the little two inches hose before the PCV? It connects to the intake.
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Old Jun 16, 2008 | 03:43 PM
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Originally Posted by 5301113
FOUND A CRACK ON THE PCV HOSE .I dont know what size it is to replace it
It the hose from the tp to the pcv , two inches long

Just did mine yesterday. SES light went off within 25 miles. Sounded cool while it was doing it like a baby turbo...
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Old Jun 16, 2008 | 03:45 PM
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Originally Posted by 5301113
Is that the little two inches hose before the PCV? It connects to the intake.
nope its the hose on top of the intake right after the throttle body! unless u removed ur factory egr system!
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